BATSE Observations of GRB 991216

摘要

Observations of the afterglow of gamma-ray burst GRB 991216 have been reported at wavelengths from radio to the X-ray band. BATSE observations at energies above 20 keV show the gamma-ray emission to consist of 2 distinct impulsive episodes separated by 15 seconds and having a total duration of about 40 seconds, followed by a long tail which persists at least 1000 s beyond the trigger time. We present temporal and spectral characteristics of both the prompt and extended emission, and explore whether the tail might be the gamma-ray signature of the afterglow.